I regret my life decision

Shizuki Yachiro who's the 17-year-old that just wants a peaceful and ordinary life

Although he prefer solitude over unnecessary conversations, spends his days studying, playing games and observing people from a distance, believing that most human problems are caused by their inability to understand themselves.

Then one night, he makes the worst decision of his life.

After finding a mysterious pendant in his room, Yachiro assumes it is nothing more then a prank and puts it on without a second thought.

That single choice binds him to Alice Rifa Shine, a mysterious girl who claims to be an angel.

Now, Yachiro discovers that hidden within human emotions are demons born from pain, loneliness, despair and other negative emotions. These demons grow stronger by feeding on emotional suffering, threatening to break free and bring chaos to the world.

To stop them Yachiro must become an assistant to a Protector and the help save the world affected by these demons.

The only problem?

The strongest way to free a person's heart is through the power of love.

A person who avoids relationships, dislikes attention and considers people exhausting is now forced into the impossible task of understanding emotions, forming connections and helping others fall in love.

Using his sharp observation and knowledge of human behavior mix with his strategic thinking, Yachiro begin solving emotional problems like puzzles sometimes guiding situations from behind the scenes, sometimes confronting them directly.

But as he gets closer to the people he saves, he begins to question his own beliefs about human connection.

Maybe people aren't as simple as he thought.

Maybe emotions aren't weakness.

And maybe the decision he regrets the most...

Will become the one that changes his life forever.